[sessions] Introduce iOS implementation of LiveTab interface

[sessions] Introduce iOS implementation of LiveTab interface

This CL introduces IOSLiveTab, an iOS-specific implementation of the LiveTab
interface that is backed by WebState (the iOS analogue of WebContents).

BUG=371476
Committed: https://crrev.com/1529bc849551e12b793fab9d01dd1c0b0110c871
Cr-Commit-Position: refs/heads/master@{#351100}

[blundell, 2015-09-28 15:22:16]

blundell@chromium.org changed reviewers:
+ sdefresne@chromium.org, sky@chromium.org

[blundell, 2015-09-28 15:22:17]

sdefresne: for iOS-specific review.
sky: for OWNERS review.

[sdefresne, 2015-09-28 15:24:56]

lgtm

https://codereview.chromium.org/1372103002/diff/1/components/sessions/ios/ios...
File components/sessions/ios/ios_live_tab.h (right):

https://codereview.chromium.org/1372103002/diff/1/components/sessions/ios/ios...
components/sessions/ios/ios_live_tab.h:1: // Copyright (c) 2011 The Chromium
Authors. All rights reserved.
nit: 2015 and remove "(c)"

[blundell, 2015-09-28 15:28:22]

https://codereview.chromium.org/1372103002/diff/1/components/sessions/ios/ios...
File components/sessions/ios/ios_live_tab.h (right):

https://codereview.chromium.org/1372103002/diff/1/components/sessions/ios/ios...
components/sessions/ios/ios_live_tab.h:1: // Copyright (c) 2011 The Chromium
Authors. All rights reserved.
On 2015/09/28 15:24:55, sdefresne wrote:
> nit: 2015 and remove "(c)"

Done.

[sky, 2015-09-28 17:56:24]

LGTM

[blundell, 2015-09-28 18:17:46]

The CQ bit was checked by blundell@chromium.org

[blundell, 2015-09-28 18:17:47]

The patchset sent to the CQ was uploaded after l-g-t-m from
sdefresne@chromium.org
Link to the patchset: https://codereview.chromium.org/1372103002/#ps20001
(title: "Response to review")

[commit-bot: I haz the power, 2015-09-28 18:20:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1372103002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1372103002/20001

[commit-bot: I haz the power, 2015-09-28 19:19:57]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-28 19:21:02]

Patchset 2 (id:??) landed as
https://crrev.com/1529bc849551e12b793fab9d01dd1c0b0110c871
Cr-Commit-Position: refs/heads/master@{#351100}